Know this keyring?

The attached photo is a poor representation of a keyring I've been looking for. I saw it in a print advert for something a year or so ago (maybe a mobile phone company). It is chrome plated/silver, horseshoe-shaped, with a small chrome ball almost closing the gap at each end. The size is as I perceived it from the picture. I've searched the net to no effect, and never seen a similar one in any shop, catalogue etc. Anyone recognise it, or offer any sourcing suggestions?